Starlight: List of Problems

Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

Need help searching? Click for format/examples of problems

AMC 8: [year] AMC 8 Problem #, Ex: 2013 AMC 8 Problem 1
AMC 10: [year] AMC 10A Problem # OR [year] AMC 10B Problem #, Ex: 2015 AMC 10A Problem 16
AMC 12: [year] AMC 12A Problem # OR [year] AMC 12B Problem #, Ex: 2021 AMC 12B Problem 25
AIME: [year] AIME I Problem # OR [year] AIME II Problem #, Ex: 2013 AIME I Problem 8
USAJMO/USAMO: [year] USAJMO/USAMO Problem #, Ex: 2023 USAJMO Problem 1
Codeforces: Codeforces [contest id (e.g. 101)][problem id (e.g. A, B, C)]: [Codeforces problem name], Ex: Codeforces 1336F: Journey
AtCoder: AtCoder [contest id (e.g. ABC314, ARC164, ZONE2021)]: [problem id (A, B, C)]. [Problem name], Ex: AtCoder ZONE2021: E. Sneaking
DMOJ: DMOJ [contest name (if applicable)] [problem number (e.g. P1)] - [Problem name], Ex: DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
USACO: [year] [contest month (e.g. January, US Open)], [division (e.g. Gold)]: [Problem name], Ex: USACO 2023 US Open Contest, Bronze: Rotate and Shift

ID	Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
19801	DMOJ New Year's '16 P6 - Cake Balancing
19800	DMOJ New Year's '16 P5 - Eggnog Dilemma
19799	DMOJ New Year's '16 P4 - DIY Christmas Tree
19798	DMOJ New Year's '16 P3 - Arithmetic Snowman
19797	DMOJ New Year's '16 P2 - The 365 Days of Christmas
19796	DMOJ New Year's '16 P1 - Late Christmas Shopping
19795	DMOJ New Year's '15 P6 - Tiles
19794	DMOJ New Year's '15 P5 - Message to Mars
19793	DMOJ New Year's '15 P4 - Leftover Eggnog
19792	DMOJ New Year's '15 P3 - Gift Wrap
19791	DMOJ New Year's '15 P2 - Food Selection
19790	DMOJ New Year's '15 P1 - Invitation Devastation
19789	DMOJ Yet Another Contest 6 P6 - No More Snakes and Ladders
19788	DMOJ Yet Another Contest 6 P5 - No More Coyotes
19787	DMOJ Yet Another Contest 6 P4 - No More Nails!
19786	DMOJ Yet Another Contest 6 P3 - No More Cell Phone Messaging
19785	DMOJ Yet Another Contest 6 P2 - No More Telemarketers
19784	DMOJ Yet Another Contest 6 P1 - No More Separation
19783	DMOJ Yet Another Contest 5 P5 - No More Concerts
19782	DMOJ Yet Another Contest 5 P4 - Nils++
19781	DMOJ Yet Another Contest 5 P3 - Potted Plants
19780	DMOJ Yet Another Contest 5 P2 - Big Score
19779	DMOJ Yet Another Contest 5 P1 - Number Pyramid
19778	DMOJ Yet Another Contest 4 P6 - No More Solitaire
19777	DMOJ Yet Another Contest 4 P5 - Signpost
19776	DMOJ Yet Another Contest 4 P4 - Even The Odds
19775	DMOJ Yet Another Contest 4 P3 - Canadian Cactus Competition
19774	DMOJ Yet Another Contest 4 P2 - Alchemy 2
19773	DMOJ Yet Another Contest 4 P1 - Snap
19772	DMOJ Yet Another Contest 3 P5 - No More Thieves
19771	DMOJ Yet Another Contest 3 P4 - Rumour
19770	DMOJ Yet Another Contest 3 P3 - Topology
19769	DMOJ Yet Another Contest 3 P2 - Work Experience
19768	DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
19767	DMOJ Yet Another Contest 2 P6 - Travel Budget
19766	DMOJ Yet Another Contest 2 P5 - Mirror Maze
19765	DMOJ Yet Another Contest 2 P4 - No More Arithmetic
19764	DMOJ Yet Another Contest 2 P3 - Maximum Damage
19763	DMOJ Yet Another Contest 2 P2 - Secret Sequence
19762	DMOJ Yet Another Contest 2 P1 - Betting
19761	DMOJ Yet Another Contest 1 P6 - Alchemy
19760	DMOJ Yet Another Contest 1 P5 - Hopping Kangaroos
19759	DMOJ Yet Another Contest 1 P4 - No More Searching
19758	DMOJ Yet Another Contest 1 P3 - Fluke
19757	DMOJ Yet Another Contest 1 P2 - A Boring Problem
19756	DMOJ Yet Another Contest 1 P1 - Mixed Doubles
19755	DMOJ Crosswords
19754	DMOJ James' XOR Update
19753	DMOJ XOR Sum
19752	DMOJ XOR Minimum

Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)

19801

DMOJ New Year's '16 P6 - Cake Balancing

19800

DMOJ New Year's '16 P5 - Eggnog Dilemma

19799

DMOJ New Year's '16 P4 - DIY Christmas Tree

19798

DMOJ New Year's '16 P3 - Arithmetic Snowman

19797

DMOJ New Year's '16 P2 - The 365 Days of Christmas

19796